[QuickSN95]

Hi,

I have a question concerning the SCT X4 tuning parameters, specifically with gearing. I have a 2011 GT 5.0 M6 with factory installed 3.73 gears. In the SCT tune options menu there is a selection for gearing. Should I leave this as the "stock" value, or change it to 3.73?

I called SCT to ask them about this, but unfortunately they're off until the January 5th 2015.

Thanks in advance!

 

[zinc03svt]

Whomever did your tune should know and apply that information. If you don't know just select the 3.73 option.

 

[QuickSN95]

Whomever did your tune should know and apply that information. If you don't know just select the 3.73 option.

It's not a custom tune, but rather the default options for the SCT Tuner. I just got back from a few runs. I tried both the "Stock" setting and the 3.73 setting and did not notice a difference in performance, or the speed reading (utilized 2 different GPS speed sensors). I'm guessing the SCT program is utilizing/referencing the original ECU value for the "Stock" setting, but I'll contact SCT to confirm. confused013.gif

Thanks!

 

[Blackpenguin69]

If you click stock it will default to the gears your car already is tuned for. If you click 3.73's it will change your stock tune from 3.73 to 3.73. You really can click either one you want. I would just keep it stock so it defaults to your car since your gears were never changed. But you really cant go wrong either way.

 

[QuickSN95]

If you click stock it will default to the gears your car already is tuned for. If you click 3.73's it will change your stock tune from 3.73 to 3.73. You really can click either one you want. I would just keep it stock so it defaults to your car since your gears were never changed. But you really cant go wrong either way.

Yep, makes sense since I didn't notice a difference between the 2 settings. My initial concern was if I selected "stock" that it would program for the base stock 3.31 gears vice the 3.73 factory upgrade option. I left it on the 3.73 setting just to play it safe.

 

[2013GTBBQ]

So if you go from 3.31 to 3.73 gears on a stock ecu tuned car, the only difference in programming is for the speedometer, right?

 

[QuickSN95]

So if you go from 3.31 to 3.73 gears on a stock ecu tuned car, the only difference in programming is for the speedometer, right?

Good question; I believe the recalibration is the only thing that's done, however, my initial assumption was that a performance tune would also take advantage of the torque multiplication factor (?).

 

[scottmach]

Be careful on the base SCT tune. They've been known to have a lot of timing in them. With no changes in cam timing of course. I would consider an email tune from Lund, AED, etc etc.

 

[QuickSN95]

Be careful on the base SCT tune. They've been known to have a lot of timing in them. With no changes in cam timing of course. I would consider an email tune from Lund, AED, etc etc.

Yep, I've read the same. I'm hoping the 87 tune is mild on timing as I'm running the that tune for now while I wait for my VMP tune.

 

[JBert]

Good question; I believe the recalibration is the only thing that's done, however, my initial assumption was that a performance tune would also take advantage of the torque multiplication factor (?).

There is no tuning needed for rear gears, except to correct the speedometer calibration.

No tuning required to "take advantage of the torque multiplication factor" -- that is purely a mechanical thing and happens all by itself with no computer involvement whatsoever.

Tuning is generally only needed for things that affect the electronic sensors that feed info to the computer or control things.